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B. Make Piping Sweat Connections
Remove plastic caps from liquid and suction service valves.
Use refrigerant grade tubing. Service valves are closed from
the factory and ready for brazing. After wrapping the service
valve with a wet cloth, the tubing set can be brazed to the
service valve using either silver bearing or non-silver bear-
ing brazing material. Consult local code requirements.
Refrigerant tubing and indoor coil are ready for leak testing.
NOTE: Unit is shipped with a full factory charge of R-22
refrigerant as indicated on nameplate.
Pass nitrogen or other inert gas through piping while braz-
ing to prevent formation of copper oxide.
C. Provide Safety Relief
A fusible plug is located in unit suction line; do not cap this
plug. If local code requires additional safety devices, install
as directed.
IV. MAKE ELECTRIAL CONNECTIONS
A. Power Wiring
Unit is factory-wired for voltage shown on nameplate. Pro-
vide adequate, fused disconnect switch within sight of unit,
readily accessible but out of reach of children. Provision for
locking the switch open (off) is advisable to prevent power
from being turned on while unit is being serviced. Disconnect
switch, fuses, and field wiring must be in compliance with
NEC (U.S.A. Standard) and applicable local codes. Use mini-
mum 60 C wire for field power connection.
Route power wires through opening in the unit side panel
and connect in unit control box as shown on unit label dia-
gram and Fig. 5 and 6. Unit must be grounded.
B. Control Circuit Wiring
Control voltage is 24 v. See Fig. 5 and unit label diagram for
field-supplied wiring details. Route control wire through
opening in the unit side panel to connection in unit control
box.
NOTE: For wire runs up to 50 ft (15 m), use no. 18 AWG
(American Wire Gage) insulated wire (35 C minimum). For
50 to 75 ft (15 to 23 m), use no. 16 AWG insulated wire. For
more than 75 ft (23 m), use no. 14 AWG insulated wire. See
Table 2 for conversion to European wire sizes.
NOTE: Operation of unit on improper line voltage constitutes
abuse and could affect any applicable warranty. See Table 3.
Do not install unit in system where voltage may fluctuate
above or below permissible limits.
See Table 3 for recommended fuse sizes. When making elec-
trical connections, provide clearance at unit for refrigerant
piping connections.
Use indoor unit transformer as 24-v (40-va minimum) supply
for system as shown in Fig. 5 or use accessory transformer.
C. Connections to Duct-Free Fan Coil Units
The 538J units are designed for easy match-up to 619C,
619F, 619ENX018 and 619ENX024 duct-free fan coils. These
units provide 24-v power for the outdoor unit from the fan
coil. Connect the Y and C terminals of the indoor unit to the
blue and brown wires of the outdoor unit with 20 gage (mini-
mum) thermostat wire.
V. ACCESSORY INSTALLATION
Install all unit accessories per accessory installation instruc-
tions prior to start-up.
Do not use accessory Time Guard® II device when combining
a 538J unit with 619E indoor units.
When ambient temperature will fall below 55 F (13 C), acces-
sory low ambient controller (part no. 53DS900060) is
required. When accessory low ambient kit is used, unit
should also be equipped with accessory winter start kit and
field-fabricated wind baffles.
CAUTION: To avoid damage while brazing, service
valves should be wrapped in a heat-sinking material
such as a wet cloth.
CAUTION: When brazing tubing sets to the ser-
vice valves, a brazing shield must be used to prevent
damage to the painted unit surface.
WARNING: Unit cabinet must have an uninter-
rupted, unbroken electrical ground to minimize the
possibility of personal injury if an electrical fault
should occur. This ground may consist of electrical wire
connected to the unit ground lug in control compart-
ment, or conduit approved for electrical ground when
installed in accordance with NEC, ANSI/NFPA (Ameri-
can National Standards Institute/National Fire Protec-
tion Association) 70, and local electrical codes. Failure
to follow this warning could result in the installer
being liable for personal injury to others.
CAUTION: Unit failure as a result of operation on
improper line voltage or excessive phase imbalance
constitutes abuse and may cause damage to electrical
components. Such operation will invalidate any appli-
cable warranty.
WARNING: Before performing service or mainte-
nance, be sure the indoor unit main power switch is off
and indoor blower has completely stopped. Failure to
do so may result in electrical shock or injury from
rotating fan blades.